Question A) Compare between open tabular column and packed columns in gas chromatography? B) Explain temperature programming for gas chromatography and what its benefits. C) in the separation of these 8 organic herbicides using HPLC in two different modes: Isocratic elution and gradient elutions. Stationary phase is C18 and the eluent is water-acetonitril (ACN) mixture as presneted in the figure. Rate is the same (1ml/min, Temperature is the same 35 °C). i) Compare both the isocratic elution and gradient elution in this experiment. ii) explain why component 8 comes at 30 min in gradient elution without peak tailing while it appears at - 65 min in isocratic elution as shoeter and wider peak with tailing. Isocratic Elution Gradient Elution 70% aqueous/30% ACN 20 - 60% ACN in 30 min. 1,2 4 5 4 Sample: 1. Tebuthiuron 2. Prometon 3. Prometryne 4. Atrazine 5. Bentazon 6. Propazine 7. Propanil 8. Metolachlor 2 3 6. 7 25 50 75 0 5 10 15 20 25 30

Question A) Compare between open tabular column and packed columns in gas chromatography? B) Explain temperature programming for gas chromatography and what its benefits. C) in the separation of these 8 organic herbicides using HPLC in two different modes: Isocratic elution and gradient elutions. Stationary phase is C18 and the eluent is water-acetonitril (ACN) mixture as presneted in the figure. Rate is the same (1ml/min, Temperature is the same 35 °C). i) Compare both the isocratic elution and gradient elution in this experiment. ii) explain why component 8 comes at 30 min in gradient elution without peak tailing while it appears at - 65 min in isocratic elution as shoeter and wider peak with tailing. Isocratic Elution Gradient Elution 70% aqueous/30% ACN 20 - 60% ACN in 30 min. 1,2 4 5 4 Sample: 1. Tebuthiuron 2. Prometon 3. Prometryne 4. Atrazine 5. Bentazon 6. Propazine 7. Propanil 8. Metolachlor 2 3 6. 7 25 50 75 0 5 10 15 20 25 30

Curren'S Math For Meds: Dosages & Sol

11th Edition

ISBN:9781305143531

Author:CURREN

Publisher:CURREN

Chapter10: Reconstitution Of Powdered Drugs

Section: Chapter Questions

Problem 7.2P

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